667181440494 has 32 divisors (see below), whose sum is σ = 1482901598880. Its totient is φ = 222352387200.

The previous prime is 667181440493. The next prime is 667181440571. The reversal of 667181440494 is 494044181766.

667181440494 is a `hidden beast` number, since 6 + 6 + 7 + 1 + 8 + 144 + 0 + 494 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667181440494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667181440493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 857467 + ... + 1438614.

It is an arithmetic number, because the mean of its divisors is an integer number (46340674965).

Almost surely, 2^667181440494 is an apocalyptic number.

667181440494 is an abundant number, since it is smaller than the sum of its proper divisors (815720158386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667181440494 is a wasteful number, since it uses less digits than its factorization.

667181440494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301473 (or 2301467 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 667181440494 in words is "six hundred sixty-seven billion, one hundred eighty-one million, four hundred forty thousand, four hundred ninety-four".